I’ve been VERY happy with the comfort of my klymit static v pads, but they’re very low r value and I’ve spent more cold nights on them than I care to admit. I’d rate the non insulated as appropriate for summer only, and only when your sleeping bag is way overrated (40* nights are not uncommon in July/Aug in the mountains). The insulted version is better, but I wouldn’t use it in cold weather (below freezing) unless adding a second (foam) pad. They are, however, comfortable for a side, back and stomach sleeper, and the price is right!
I’ve recently switched to an exped dura 8r for winter and also have found that to be very comfortable in all positions. The difference in R value is amazing. My 17* down bag keeps me warm enough to sleep in 25* weather, meaning slightly cool, but def not cold. This seems in line with sleeping bag ratings, is way better than any of my klymits, and is saying something since I’m a bit of a cold sleeper.
Summer and sometimes spring/fall = klymit
Winter / cold weather = NOT klymit!
I did heavily consider the thermarest xtherm. It’s highly rated and probably the lightest winter pad, but it had just enough negative delamination reviews to turn me off.
